Try this: Noise cancel and then if still noisy use the + or - button and go up or down in the numbers and if it seems even the tiniest bit quieter then noise cancel again right there. I have had to do that 2 or 3 times on a spot but it seems to work. Dont jack with the sensitivity, just go up or down in the numbers. I also had one situation where there was a very audible constant 'warble'. I did the noise cancel twice or more, then did the up and down numbers and it finally realized it was having a brain issue and settled down.